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Full Discussion: Multi User Multi Task
Top Forums UNIX for Dummies Questions & Answers Multi User Multi Task Post 302070804 by amro1 on Friday 7th of April 2006 01:04:06 PM
Old 04-07-2006
here...

Multi task is ability to maintain schedule for more than one process. As normally number of processes exceeds by far number of CPUs in a system, the system scheduler becomes the core part of such multitasking. There is no real multitasking though, as only one process occupies processor's registers at time. However as it happens relatively fast it creates illusion of many processes flowing simultaneously. Multitasking systems is an opposition to mono tasking system as MS-DOS was. While in MS-DOS it was possible to have some processes to simulate simultaneous execution it was dome by using range of interruptions that is not a part of the system and worked more as a switch, while one process was working, until user would not designate manually recourses to the next process it would keep the current state.
Yes Windows XP is by all means a multitasking system.
Multi-User system implies that system can handle simultaneously more than one user. It means that system knows how to recognize the user, how to keep the environment and how to separate recourses between users.
Yes Windows XP is by all means a multi-user system.
The both Windows XP and UNIX may have many users connected using different hardware means and having sessions simultaneously.
I suspect you ask it as a point of comparison to Window/UNIX advantages/disadvantages. Let me tell you that the major advantage of any UNIX system is its simplicity. UNIX has very simple architecture compounded of many subsystems. If something is going wrong you always can trace problem to the specific subsystem. Each subsystem is mostly independed and may be stopped/started/ refreshed with no influence to anything else. Each subsystem is open, it means it may be discovered by regular mortals simply by reading man page; it has no "magic" involved. UNIX despite its evolution had some revolutionary steps in development and does not have to take increasing care of backward compatibility in its worst sense, because most of the programs can be recompiled with little efforts.
As system is modular it is easily upgradeable, many different teams of developers can coexist with little disturbance to one another, they don't have create “the system”, they are responsible for a little part and this way makes the system in general very reliable. There are many competing projects; each try to prove its module is the best.
Sorry for tedious port.
 

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Cache::Memcached::Managed::Multi(3pm)			User Contributed Perl Documentation		     Cache::Memcached::Managed::Multi(3pm)

NAME
Cache::Memcached::Managed::Multi - multiple Cache::Memcache::Managed objects SYNOPSIS
use Cache::Memcached::Managed::Multi; my $multi = Cache::Memcached::Managed::Multi->new( @managed ); DESCRIPTION
Provides the same API as Cache::Memcached::Managed, but applies all methods called to all of the objects specified, except for new and objects. CONTEXT
All methods are called on all of the Cache::Memcached::Managed objects in the same context (list, scalar or void) in which the method is called on the Cache::Memcached::Managed::Multi object. The return value differs in format depending on the context also: scalar my $listref = $multi->method; print "Result: @{$listref} "; When called in scalar context, a list ref with scalar values is returned in the same order in which the objects are used (which is determined by the order in which they were supplied with new and returned by objects.. list my @listref = $multi->method; print "Result $_: @{$listref[$_]} " foreach 0..$#listref; When called in list context, a list of list references is returned in the same order in which the objects are used (which is determined by the order in which they were supplied with new and returned by objects. void $multi->method; When called in void context, nothing is returned (not strangely enough ;-). SPECIFIC CLASS METHODS
There is only one specific class method. new my $multi = Cache::Memcached::Managed::Multi->new( @managed ); Create an object containing multiple Cache::Memcached::Managed objects. Returns the instantiated object. SPECIFIC INSTANCE METHODS
objects my @managed = $multi->objects; Returns the list of instantiated Cache::Memcached::Managed objects that the object is a proxy for. AUTHOR
Elizabeth Mattijsen COPYRIGHT
(C) 2005 - 2006 BOOKINGS (C) 2007 BOOKING.COM This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. perl v5.14.2 2012-05-24 Cache::Memcached::Managed::Multi(3pm)
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